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She asked Boardmasters for details about her brother's treatment at the festival, including questioning why a meningococchal rash wasn't diagnosed and the care he received before he fell into a coma.

"The information we have of George leaving your care and turning up is hospital is patchy for us and hospital here and we would be interested in talking to your medical team who had the privilege of his final few conscious moments to be able to piece it all together," she added.

In a post on Facebook Boardmasters shared a tribute to the teenager.

The Boardmasters team say they are 'deeply saddened'

It said: "The Boardmasters team are deeply saddened to hear of the passing of George Zographou who attended Boardmasters last weekend. We extend our sincerest sympathies and our thoughts are with his family and friends at this difficult time."

In a further statement detailing George's care, a spokesman for Boardmasters said: "A teenage male was treated at Boardmasters festival and was seen and assessed on site by two anaesthetic/intensive care doctors and two critical care paramedics who were part of the medical team on site.

"We understand he was unwell prior to attending the festival. The patient was assessed fully including initial blood and urine tests to identify life threatening illness that were all initially negative.

"He was transferred with a doctor and paramedic to hospital after his condition deteriorated after transfer to a welfare area. We have been in contact with his family and are offering any support we can at this difficult time and have notified Public Health England regarding the case."

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A Boardmasters representative added that Nicole shared the message on Saturday evening and was contacted the following morning by Boardmasters' doctor who clarified the details with her.

Deputy director of health protection at PHE's South West health protection team, Mike Wade, said: "Our thoughts are with the family of the patient at this difficult time and we want to reassure people that all appropriate public health actions are being taken.

"It is highly unlikely that this case is related to the previous cases at St Brendan's which occurred 14 months ago. The student has not attended the college since the end of the summer term at the beginning of July."